Each of these waveforms start at zero potential and they gradually or suddenly jump up in the positive direction to the full potential of the force applied on them. Then the waveform gradually or suddenly returns to zero and immediately repeats the same waveform in the negative direction. This entire transition (one plus and one minus pulse) is the cycle or period of the wave, and it will continue repeating as long as the force is applied.
The sine wave has the gradual change, and the square wave has the sudden jump. Sine waves are produced by alternators in cars and power plants by the force of the car engine or the power plant turbines. Square waves are produced by inverters that can change
You may have noticed that we changed currents from
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